diff --git a/docs/source/design.rst b/docs/source/design.rst
index 580fe7c1..3711d794 100644
--- a/docs/source/design.rst
+++ b/docs/source/design.rst
@@ -5,7 +5,7 @@
 Design
 ======
 
-A brief description of an architecture of Gunicorn.
+A brief description of the architecture of Gunicorn.
 
 Server Model
 ============